[neonixie-l] Re: Tubes in a Sperry Remington 1213 calculator

[Tomasz Kowalczyk]

Oh crap. You've linked that page already. 

W dniu sobota, 8 lipca 2017 22:36:04 UTC+2 użytkownik Tomasz Kowalczyk 
napisał:
>
> These are definitely VFD tubes. The mesh seen on the photo is the grid. I 
> think no other display technology would have this wonderful greenish blue 
> colour.
> I tried googling it too. I think these might be LD8035 tubes.
> On this site there are good quality photos of the interior.
> http://www.alciom.com/perso/calc/sperry-remington/1213/descrcalc.htm
>

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[neonixie-l] Re: BR355 GPS receivers for $30 on EBay

[MichaelB]

Hey Michael, that's a great deal for a nice GPS that many of us diehards 
still use on those clocks that still work best with it. Thanks for sharing! 
Let's hope this seller is a reliable source. 

On Friday, July 7, 2017 at 8:37:50 PM UTC-7, MichaelS wrote:
>
> In case anyone needs a BR355 GPS receiver, see this listing 
> 
>  (listing 
> no. 382122000258)
>
> The usual disclaimers apply.  I haven't bought from the company before, 
> etc.  $30 delivered (US) seems like a good price if you have a use for it. 
>  A handful of clocks are supposed to work with these.
>
>
>
>

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[neonixie-l] Re: Tubes in a Sperry Remington 1213 calculator

[Tomasz Kowalczyk]

These are definitely VFD tubes. The mesh seen on the photo is the grid. I 
think no other display technology would have this wonderful greenish blue 
colour.
I tried googling it too. I think these might be LD8035 tubes.
On this site there are good quality photos of the interior.
http://www.alciom.com/perso/calc/sperry-remington/1213/descrcalc.htm

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Re: [neonixie-l] Re: Raspberry PI controlled Nixie display

[Paolo Cravero]

Hi.


>
> The real question now is: How long can a raspi run without crashing ?
>

As all *ni systems, a RasPI can run for years unless there is a hardware
failure or overheating. I've been (silently ;) ) collecting uptimes at work
and I've seen servers that haven't rebooted for 1600+ days
(enterprise-grade computers have redundand power supplies and hard disks
that can be hot-swapped/replaced). A RPi can perform the same.


>
> Eventually I will start logging usage of each segment, on each tube, and
> use that for depoisoning. Since it's a micro SD (flash) filesystem, which
> has limited write-cycles, I have to be careful about how often I store
> runtime information. Syncing daily to the same file (appending) could cause
> wearout after several years if the OS doesn't incorporate some form of
> levelling. Doing it every 3-4 days should get me about 100 years of logging
> if the flash has 10K write-cycle endurance. Not that I will be around then
> to do anything with that
>

Well, the write-cycle count applies to each single bit of the flash memory.
So, if you're just appending data to a file, what has been written won't
change on subsequent additions. Your filesystem might have blocks of 2 kiB,
4 kiB or 8 kiB, so that's the amount of data that could change at once if
the bucket was full yet. Then there's the filesystem internals and journal
("which blocks form a file" in simple terms, the index), that could change
more often.

OTOH Linux systems log stuff all the time to disk, so that part of the
flash disk might fail before your clock log sectors.

An option could be to upload your data to some online (free) service, since
you have WiFi.

Also, have you though of implementing a purely hardware watchdog to shut
down everything in case the software hangs?

Paolo

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